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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-09-02 12:58:20 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-02 15:22:51 (GMT)
commit9988ce685676cebe0b14dc128f00e1ae9cd1a4fa (patch)
tree5f7e2212bca74c839e686068b74ca3b3dec5d739 /fs
parent98f531b10d23e3c28e8d34c0e88822a81231b3c2 (diff)
downloadlinux-9988ce685676cebe0b14dc128f00e1ae9cd1a4fa.tar.xz
Drivers: hv: ring_buffer: wrap around mappings for ring buffers
Make it possible to always use a single memcpy() or to provide a direct link to a packet on the ring buffer by creating virtual mapping for two copies of the ring buffer with vmap(). Utilize currently empty hv_ringbuffer_cleanup() to do the unmap. While on it, replace sizeof(struct hv_ring_buffer) check in hv_ringbuffer_init() with BUILD_BUG_ON() as it is a compile time check. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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